package com.hbzjt2012.syn;

//不安全的取钱
//两个人去银行取钱，账户
public class UnsafeBank {
    public static void main(String[] args) {
        //账户
        Account account = new Account(200,"结婚基金");

        Drawing you = new Drawing(account,50,"You");
        Drawing girlFriend = new Drawing(account, 100, "girlFriend");

        you.start();
        girlFriend.start();
    }
}

//账户
class Account{
    int money; //余额
    String name; //卡名

    public Account(int money, String name){
        this.money = money;
        this.name = name;
    }
}

//银行：模拟取款
class Drawing extends Thread{
    //账户
    Account account;
    //取了多少钱
    int drawingMoney;
    //现在手里有多少钱
    int nowMoney;

    public Drawing(Account account, int drawingMoney, String name){
        super(name);
        this.account = account;
        this.drawingMoney = drawingMoney;
    }

    //取钱
    //synchronized 默认锁的是this.
    @Override
    public void run() {

        //锁的对象就是变化的量，需要增删改的对象
        synchronized(account){
            //判断有没有钱
            if(account.money - drawingMoney < 0){
                System.out.println(Thread.currentThread().getName() + "钱不够，取不了");
                return;
            }

            //sleep可以放大问题的发生性
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            //卡内余额 = 余额 - 你取的钱
            account.money = account.money - drawingMoney;
            //你手里的钱
            nowMoney = nowMoney + drawingMoney;

            System.out.println(account.name + "余额为：" + account.money);
            //Thread.currentThread().getName() = this.getName()
            System.out.println(this.getName() + "手里的钱：" + nowMoney);
        }

    }
}
